package org.opencv.core;

//javadoc:TermCriteria
public class TermCriteria {

	/**
	 * The maximum number of iterations or elements to compute
	 */
	public static final int COUNT = 1;
	/**
	 * The maximum number of iterations or elements to compute
	 */
	public static final int MAX_ITER = COUNT;
	/**
	 * The desired accuracy threshold or change in parameters at which the
	 * iterative algorithm is terminated.
	 */
	public static final int EPS = 2;

	public int type;
	public int maxCount;
	public double epsilon;

	/**
	 * Termination criteria for iterative algorithms.
	 *
	 * @param type
	 *            the type of termination criteria: COUNT, EPS or COUNT + EPS.
	 * @param maxCount
	 *            the maximum number of iterations/elements.
	 * @param epsilon
	 *            the desired accuracy.
	 */
	public TermCriteria(int type, int maxCount, double epsilon) {
		this.type = type;
		this.maxCount = maxCount;
		this.epsilon = epsilon;
	}

	/**
	 * Termination criteria for iterative algorithms.
	 */
	public TermCriteria() {
		this(0, 0, 0.0);
	}

	public TermCriteria(double[] vals) {
		set(vals);
	}

	public void set(double[] vals) {
		if (vals != null) {
			type = vals.length > 0 ? (int) vals[0] : 0;
			maxCount = vals.length > 1 ? (int) vals[1] : 0;
			epsilon = vals.length > 2 ? (double) vals[2] : 0;
		} else {
			type = 0;
			maxCount = 0;
			epsilon = 0;
		}
	}

	public TermCriteria clone() {
		return new TermCriteria(type, maxCount, epsilon);
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		long temp;
		temp = Double.doubleToLongBits(type);
		result = prime * result + (int) (temp ^ (temp >>> 32));
		temp = Double.doubleToLongBits(maxCount);
		result = prime * result + (int) (temp ^ (temp >>> 32));
		temp = Double.doubleToLongBits(epsilon);
		result = prime * result + (int) (temp ^ (temp >>> 32));
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (!(obj instanceof TermCriteria))
			return false;
		TermCriteria it = (TermCriteria) obj;
		return type == it.type && maxCount == it.maxCount && epsilon == it.epsilon;
	}

	@Override
	public String toString() {
		return "{ type: " + type + ", maxCount: " + maxCount + ", epsilon: " + epsilon + "}";
	}
}
